configure error: NetBSD 1.6.2 / wwwoffle 2.8

[Clemens Buschmann]

checking for sys/param.h... yes
checking sys/mount.h usability... no
checking sys/mount.h presence... yes
configure: WARNING: sys/mount.h: present but cannot be compiled
configure: WARNING: sys/mount.h: check for missing prerequisite headers?
configure: WARNING: sys/mount.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/mount.h... yes
checking sys/statvfs.h usability... no
checking sys/statvfs.h presence... no